Mercury-removal process in distillation tower

Inactive Publication Date: 2005-08-04
JAPAN PETROLEUM EXPLORATION CO LTD
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Benefits of technology

[0013] Mercury is an element with a high vapor pressure, and the vapor pressure becomes higher in correspondence with temperature rising and pressure dropping. Characteristics of mercury vaporization are the same as that of short-chained hydrocarbons such as pentane and hexane. The characteristics of mercury vaporization indicates possibility of mercury removal without substantial transfer of a light fraction to a vapor phase in the case where an interior of a distillation tower is held at a lower temperature. However, the lower inner temperature causes prolongation of gas/liquid contact inappropriate for efficient and economical mercury removal. The prolongation of gas/liquid contact can be avoided by the temperature profile that an inner temperature of the distillation tower, wh

Problems solved by technology

Application of the adsorption or extraction process to heavy natural gas-condensates or crude oils is difficult because of impurities.
Moreover, complicated and expensive post-treatment is indisp

Method used

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  • Mercury-removal process in distillation tower
  • Mercury-removal process in distillation tower

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example

[0036] A mercury-containing heavy natural gas-condensate was processed in a bubble-cap tray type distillation tower 1 of 13 m in height provided with a gas-injection nozzle at its lower part. The condensate L was fed as a downflow at a flow rate of 10 kl / hour into the distillation tower 1, while a natural gas G was fed as an upflow with a gas / liquid ratio of 80 m3 / kl through the gas-injection nozzle into the distillation tower 1. The condensate L came in countercurrent contact with the stripping gas G in the distillation tower 1.

[0037] A top temperature T1 and a bottom temperature T2 of the distillation tower were variously varied under the above conditions, to investigate effects of the temperatures T1 and T2 on behaviors of mercury and a light fraction. Mercury concentration of a liquid product P was measured by Atomic Adsorption Spectroscopy (Gold-Amalgamation Method).

[Conventional Process]

[0038] The distillation tower 1 was uniformly held at 120° C. without giving temperature...

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Abstract

A top temperature T1 of a distillation tower 1 is held below a liquefying temperature of a light fraction by returning a part of an exhaust gas W, which is cooled by a condenser 5, to the upper zone of the distillation tower 1. A bottom temperature T2 is raised up to 300° C. at highest by returning a part of a liquid product P from a re-boiler 3 to a lower zone of the distillation tower 1. When a liquid hydrocarbon L comes in countercurrent contact with a stripping gas G inside the distillation tower 1 with the temperature profile that an inner temperature gradually falls down along an upward direction, mercury is efficiently transferred from the liquid L to a vapor phase without effusion of the light fraction in accompaniment with the exhaust gas W.

Description

TECHNICAL FIELD [0001] The present invention relates to a process for stripping mercury from liquid hydrocarbons or the like in a distillation tower under a gas / liquid equilibrium condition. BACKGROUND OF THE INVENTION [0002] Mercury is conventionally removed from liquid hydrocarbons by an adsorption process, an extraction process using an aqueous liquid, a stripping process and so on. Application of the adsorption or extraction process to heavy natural gas-condensates or crude oils is difficult because of impurities. On the other hand, the stripping process efficiently removes mercury from liquid hydrocarbons, since mercury can be easily transferred from a liquid phase to a vapor phase by countercurrent contact of the liquid hydrocarbons with a stripping gas in a distillation tower. Transfer of mercury from a liquid phase to a vapor phase is promoted due to a high vapor pressure of mercury without unfavorable effects of impurities. [0003] According to the stripping process, a mercu...

Claims

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Application Information

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IPC IPC(8): B01D3/00C10G7/00C10G7/08C10G29/00C10G31/00
CPCC10G7/00C10G2300/205C10G31/00C10G7/08
Inventor YAMAGUCHI, YOSHIYUKIKAKU, SENICHIROCHAKI, KAZUTOSHI
Owner JAPAN PETROLEUM EXPLORATION CO LTD
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